h1 {
    text-align: center;
}
h4 {
    text-align: center;
    font-style: italic;
    color: gray;
}
.game4 {
    width: 480px;
    height: 480px;
    border: 1px solid red;
    margin: 0 auto;
}
.game4 > .kuai4 {
    width: 80px;
    height: 80px;
    border: 1px solid white;
    background-color: black;
    float: left;
    box-sizing: border-box;
    color:white;
    text-align: center;
    font-size: 20px;
    padding-top: 35px;
}
p {
    text-align: center;
}
.input4 {
    margin-bottom: 10px;
    text-align: center;
}